Turret-lathe.



Patented Sept. 4, I900.

C. A. JOHNSON.

TUBRET LATHE.

(Application filed Ap (No Model.)

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CARL A. JOHNSON, OF MADISON,- WISCONSIN.

TURRET-LATHE.

SPECIFICATION forming part of Letters Patent No. 657,242, dated September 4, 1900.

Application filed April21,1899. Serial No. 718,908. (No model.)

To all whom it may concern.-

Beit known that I, CARL A. JOHNSON, a citizen of the United States, residing at Madison, in the county of Dane and State of Wisconsin, have invented certain new and useful Improvements in 'lurret-Lathes, of which the following is a specification;

My present invention pertains to turretlathes, and has to deal more particularly with the construction of the turret, as will be hereinafter set forth.

7 The invention is illustrated in the annexed drawings, wherein- Figure 1 is a vertical sectional view of the turret and slide, and Fig. 2 a top plan View.

The object of the invention is to provide a construction for unclamping the turret-head and withdrawing the locking-pin which indexes the same with but one movement of an operating-lever. With the construction hereinafter described the turret maybe unlocked and rotated at any point on the bed.

Referring to the drawings, A denotes the slide, provided with an opening extending therethrough and in which is mounted the turret-base or bearing-plate Said bearingplate, as will be seen upon reference to Fig. 1, bears partly upon the upper face of the slide and is secured thereto by screws 0, only one of which is shown. The outer edge of the plate is formed with an inclined or beveled bearing-face D, between which and the slide is a threaded section E.

F indicates the turret-head, provided with the usual tool-seats and with a beveled or tapering bearing-face G, which rests directly upon the face D of the plate 13, as is clearly indicated in Fig. 1. It will also be noted that the dimensions of the parts are such that the turret does not touch the bearing-plate or slide at any other point, with the exception that a central post or stem II is secured to its under face and extends down through an opening formed in the bearing-plate. A collar I is mounted upon the lower end of the post and prevents theturret from being lifted off of its bearin g, sufficient movement being provided for, however, to allow the parts to be operated easily. Stem or post H is provided with a series of teeth or a rack J, into which works a worm K, mounted upon a shaft K. The shaft is arranged with suitable stops for the purpose of throwing out the feed; but as this forms no part of my present invention the device is not shown or described in detail.

As will be seen upon reference to Fig. 1, the turret at its base is undercut and is also provided with a projecting shoulder L, which extends entirely around the same. Mounted within this undercut portion or recess is a ring M, formed with a rim or flange N, adapted to bear upon the upper face of shoulder L. A second rim or flange 0, also formed integral with the ring',is threaded on its outer face and works in conjunction with the threaded section E of the bearing-plate. Ring M is made up in sections, and after being put in place is secured together by screws or in any other suitable manner. A lever P, Fig. 2, is connected to the ring and serves as a means for operating or turning the same. A bolt or stud Q is also mounted in and extends out from the ring, the purpose of which will presently appear.

R denotes the locking-pin, mounted in a suitable bearing formed in the plate B, a spring S, acting against a collar '1, secured to the pin, serving to urge the pin upward and project its upper end above the bearing-plate B intoone or another of a series of recesses or seats U, formed in the under face of the turret-head. Pin R is formed with a rack upon one side thereof, and a pinion V, carried by a shaft W, extending in through suitable bearings formed in the slide and bearing-plate, meshes with said rack. The outer end of the shaft carries an arm or lever X, which stands vertically when in its normal position and comes into the line of movement of bolt or stud Q. Normally pin R stands in its elevated position, its end protruding into one of the seats or recesses U, formed in the base of the turret concentric with the axis thereof.

. With the parts in the position indicated in the drawings the turret is held against rotation by reason of the ring M being drawn down upon the projecting shoulder L of the turret and causing the faces D and G to bind upon each other, the turret having of course been brought to that position where the pin R will enter one of the recesses or seats. The pin in entering one of the recesses or seats serves to index the turret and bring the tool.

.Which is to be used into its proper position with relation to the work. When it is desired to release the turret, all the operator has to do is to move the lever P in the direction indicated by the arrow in Fig. 2. In so doing the ring M will be elevated with reference to the bearing-plate B and the turret will be free, so far as any frictional contact is concerned, to be rotated. At the same time the lever is moved the bolt or stud Q will be carried around by the ring and come into contact with the upper end of the lever X, throwing the same over and causing the pinion V to lower the pin R, withdrawing its upper end from the seat or recess in which it happens to be at the time. When the ring has been rotated far enough to withdraw the pin, the operator lets it rest at that point and adjusts the turret to bring the desired tool into position. Lever P is then brought back in the reverse direction, which has the efiect of releasing the arm X, permitting the pin to be forced upward by the spring S and to enter the seat or recess U which is over the same. The movement of the lever in this direction serves to screw the ring M down so as to bring its inwardly-projecting flange or rim N into contact with the projecting shoulder L, binding the turret-head firmly upon the beveled face D of the bearing-plate B.

From the foregoing it will be seen that the locking-pin which indexes the turret may be withdrawn at any point along the bed, so that if short and long tools are used on the various faces of the turret it is not necessary to run the turret back in all cases to a point where the long tools will clear in swinging the turret around to place. It will therefore be seen that there are two important advantages in this device-first, the fact that the locking-pin may be withdrawn at any point, and, second, that the unclamping of the turret and the withdrawing of the locking-pin can be accomplished with the movement of one lever.

The exact construction of the turret-head and the manner in which it is connected to the bearing-plate and slide are not material to the present invention, and I do not therefore desire to limit myself to the precise details shown.

Throughout the claims, where not otherwise specified, I have employed the term slide as including the slide proper, together with the bearing-plate G. It is of course manifest that in the broad interpretation of this invention it is immaterial whether the bearingplate and slide be formed integral or not. The construction described is an advantageous one and of course is preferred over one where the slide and plate are formed together.

Having thus described my invention, what I claim is- 1. In a lathe, the combination of a slide; a turret revolubly mounted thereon and free to be rotated in either direction when unlocked; a locking-pin carried by one member and adapted to enter a seat or recess formed in the opposite member; mechanism independent of said pin for clamping the turret and slide together; and means independent of the turret and the operative portions of the lathe for positively and simultaneously operating the locking-pin and the clamping mechanism.

2. In a turret-lathe, the combination of a suitable slide provided with a bearing-face; a turret revolubly mounted upon said bearingface and free to be rotated in either direction when unlocked; a locking-pin carried by the slide and adapted to enter a recess or seat formed in the turret; mechanism independent of said pin for clamping the turret and slide together; and means independent of the turret and the operative portions of the lathe for positively and simultaneously releasing said clamping mechanism and withdrawing the locking-pin.

3. In a turret-lathe, the combination of a suitable slide provided with a bearing-face a pin mounted in said slide; means for elevating said pin; a turret revolubly mounted upon the bearing-face and free to be rotated in either direction when unlocked; a series of recesses formed in the under face of said turret; means independent of the pin for clamping the turret and slide together; and mechanism independent of the turret and the operative portions of the lathe, serving to release the clamping means and to positively and simultaneously lower the pin.

4. In a turret-lathe, the combination of a suitable slide provided with a bearing-face a turret mounted thereon and adapted to rest upon said face; a locking-pin carried by the slide and adapted to enter one of a series of recesses formed in the turret; a clamping-ring extending around the turret and connected to the base; and connections between said ring and the pin independent of the turret and the operative portions of the lathe for positively lowering the pin as the ring is rotated to release the turret.

5. In a turret-lathe, the combination of a suitable slide provided with a bearing-face; a turret mounted thereon and provided with a series of seats or recesses in its under face; a clamping-ring carried by the turret; connections substantially as described between said ring and the slide; a locking-pin mount= ed in the slide in line with the recesses in the turret; means for normally holding said pin in its elevated position; and means adapted to be operated upon by the ring as it is rotated to unclamp the turret to positively lower the pin out of engagement with the recesses.

6. In a turret-lathe, the combination of a suitable slide provided with a bearing-face; a turret mounted thereon and provided with a series of recesses in its under face; a clamping ring carried by the turret; a threaded connection between said ring and the slide; a pin mounted in the slide in line with the recesses in the turret; means for normally IIO holding said pin in its elevated position; a pinion meshing with a rack formed upon said pin; a shaft connected with the pinion; an arm carried by the other end of said shaft; and means carried by the ring serving to depress said arm as the ring is rotated to unclamp the turret.

7. In a turret-lathe, the combination of a suitable slide provided with a bearing-face; a turret mounted thereon and provided with a series of recesses in its under face; a clamp ing-ring M carried by said turret; a threaded connection between said ring and the slide; a pin mounted in the slide; a spring for normally holding the pin in its elevated position; an arm X, and connections between said arm and the pin; a bolt or stud Q carried by the clamping-ring in line with the upper end of the arm X; and a lever for operating the ring.

8. In a turret-lathe, the combination of a slide A; a bearing-plate B secured thereto, and provided with an inclined or beveled face D and a threaded portion E adjacent thereto; a turret provided with a bearing-face G adapted to rest upon the inclined face D; a series of recesses formed in the under face of the turret; a clamping-ring M carried by the turret and provided with a threaded portion adapted to engage with the threaded portion of the bearing-plate; a stud Q carried by said ring; a lever P also carried by said ring; a pin R mounted in the bearing-plate; a spring serving to hold said pin in its elevated position; a rack formed upon said pin; a pinion meshing with said rack; a shaft connected to said pinion and mounted in suitable hearings in the slide; and an arm X carried by the outer end of said shaft in line with the stud Q.

In witness whereof I hereunto set my hand in the presence of two witnesses.

CARL A. JOHNSON.

Witnesses:

W. R. BAGLEY, EDWARD F. APPLEBY.

Cal 

